Sheet-control mechanism



July 1927' J. R. BLAINE SHEET CONTROL IBCHANISI Fi led lay a. .1924 zsneets-sneet 1 ZZZ/2132,65; QQM/M 1,636,404 July J. R. BLAINE f S38E11 CONTROL IECHANISI Filed lay 3. 19 4 z shuns-sheet 2 Patented July 19, 1927.

UNITED STATES PATENT OFFICE;

aosnrn a BLAINE, or on: ranx, ILLINOIS, assmnon '10 1111mm; rnnrrme Puss a muracruame commuw, or 011101100, mmors, A conrom'rxon or 11.1.nwo1s sneer-censor. momma;

Application filed Bay 3,

This invention relates to sheet control mechanism which is adapted for use in printing presses and the like.

One object of the invention is to provide 5 simple and efficient means to prevent feeding of a sheet after the press is tripped, whether tripped manually or automatically.

Another object is to provide sheet con- I trol' mechanism for use in printing presses adapted to meet the various requirements under service conditions.

These and other objects are accomplished by means of the arrangement disclosed on the accompanying sheets of drawings, a in which Figure lis a fragmentary side elevation of a rinting press embodying my invention;

igure. 2 1s an enlarged detail view showing such control parts in side elevation; and igure 3 is a fragmentary top plan view, parts being shown in section, and takenin ,the laneof line 3-3 of Figure 2.

The various novel features of the invention will be apparent from the following description and drawings, and will be articularly pointed out in the appendedclaims.

Referring to the drawings,'it will be noted that the invention is disclosed in. connection with a printing press having a main frame '10finwhmrotatably mounted impression cylinder 11 issupported, sheet material being fed from a feed pile 12, down over'a feed board 13 to a front guide,(not shown) preparatory to being gripped by the gripas pers on thecylinder 11.

If for any reason the press is tripped, it is im ortant that further feeding of sheets should be stopped whether the press is tripped as a result of poor registering by means of the arrangement disclosed in my copjending application, Serial N 0. 710,755 filed T ay 3,1924, or tripped manually, as dis-- closed in' said same application, or tripped. as a result of plural. sheet detection which a will be more fully described in this present -application. -&

As will be pointed out more fully hereinafter,'.whenever the press is tripped an automatically actuated sheet clamp or holding or stopping member 15 will: be liberated and pressed into engagement with -a sheetof 13 and between the latter and said clamp 15. The clamp 15 takesthe form of a suitably U shaped rod which is adjustably secured 1924; serial in. 110,751.

a bracket 17 formed on a lever arm 18 mounted on a rock shaft 19. The lever arm l8 rests upon an arm 20 secured to a rock shaft 21 to which also issecured an arm 22 pivotally connected at 23 to a link 24 also pivotally connected at 25 to an arm 26 secured to a shaft 27 which also has secured to it a latch 28, normally pressed for rotation in a counterclockwise direction, as viewed in.

Figure 2 of the drawings, by a spring 29.

From the connections thus far described, it will be appreciated that if the latch 28 is freed from a locking dog 30 which normally holds it against movement, the spring 29 w ll rotate the latch 28 in a counterclockwise direction for raising the lever arms 20 and 18 and forcing-the clamp 15 into engagement witha sheet of material 16, clamping the latter between the clamp and feed board13with sufiicient force to prevent further progressive feeding of said sheet.

1 The locking do 30 is pivotally connected to a link 31 whic in turn is pivotally connected at 32- toa bell crank lever 33 which is pivotally connected to another link 34 connected to the main trip lever 35 through which thepress is tripped. As mentioned hereinabove, whenever the press istripped regardless of thecause of the tripping, the

lever 35 is depressed, withdrawing the locking ipfgjLfor permitting ositive applica-v tion 0 the clamp 15 to a fe sheet of paper.

As stated before, the tripping of the press I by relativelgeadjustable members-38 and "39 which may supported in any suitable way and in a mannerrrto vary the openingthrough' thesthroatr Preferably the throat member 39gfiprovidedwith a slot 40 for the reception of a detector member 41 having an upper are shaped surface which preferably lies in the same plane as the top of the throat member 39 at the oint where the detector member is norma 1y located, so that .sheet materialpassmg over and in engagematerial 16 being fed over the feed board' ment vwith the throat member 39. also will pass over'a'nden the arcuate surface of the g detector 41. e detector 41ywi11 remam' -"injthe position shown in Figure 280 bll detector member 41, resulting in the clamping of the fed sheet between the clamp 15 and the feed table 13. The detector 4:1 is suitably pivotally connected at 42 to a suitablytsupported bracket 43 and is limited in its counterclockwise movement by engaging a stop 44 on said bracket. Normally, a laterally extending lug 45 formed on the detector 4-1 is engaged by anJarm l6 of a twoarmed lever 47 pivotally supported upon a shaft 48, the second arm 49 being pivotally connected at 50 to a link 51 having one end pivotally connected to one arm 52 ofa bell crank lever pivoted at 53, the other arm 54 of said bell crank lever having a roller 55 adapted to ride on a suitably actuated and timed cam 56 and under certain predetermined conditions pass into a depression 57 in'said cam for the purpose of withdrawing the locking dog 30-for causing an application of the clamp 15. 'In this connection it will be noted that also mounted upon the shaft 48 is an arm 58 which engages the upper end of the locking dog 30 for disengaging the latter from the latch 28 for permitting-the clamping action referred to. The leverarm 52 is pressed by a spring 59 in a clockwise direction, as viewed in Figure 1, for the purpose of holding the roller 55 against the cam 56 and for pressing the locking do '30 out of engagement with the latch 28 w en the roller-.55 is presented to the cam, recess 57 and is permitted to i move thereinto. This results only when the 4 than a single sheet 0 plural sheet detector/i1 has been rotated iii a clockwise direction, as viewed in Figure 2, for liberating the lever a'rm'46 from the lug 45. Through the connections described it is apparent therefore that when more f material is fed through the throat 37, or when a.single sheet of material of excessive thickness is fed therethrough, the detector 41 will be rotated in a. clockwise direction, thereby liberating lever. 46 for permitting the spring 59 through connectionsdescribsfl, to h w th locking dog 30 out .of locking-engagem with the latch 28 for permitting the clampirig member 15, through the spring 29, tobe positively forced down into, clamping engagement with a fed sheet, preventing further feeding movement thereof.

It is my intention to cover all modifications of the invention falling within the spirit and scope of the following claims. v

I claim: r j 1.- In a printing press, the combination of a press tripping member, a sheet clamping member for preventing feeding of .a sheet under abnormal sheet feeding conditions, a

latch operatively connected to said press tripping memberand normally holding said sheet clamping member in an inoperative position, and plural sheet detector means operative upon said latch for permitting said clamping member to exert a clamping action and for causing the tripping of the press upon the occurrence of such abnormal sheet feeding conditions.

'2. In a printing press, thecombination of a press tripping member, a sheet clamping member for preventing feeding of the sheet under abnormal sheet feeding conditions, means operatively connected to said press tripping member and normally holding the said sheet clampingmember in an ineffective position, and plural sheet detector means operative upon said first mentioned means for permitting said clamping member to exert a clamping action and for causing the tripping of the press upon the occurrence of abnormal sheet feeding conditions.

3. In a printing press, the combination of a sheet clamping member for preventing feeding of a sheet under abnormal, sheet feeding conditions, a latch operatively connected to saides's tripping member and normally holding sai heet clamping-memher in an inefiectiveposition, a cam-with s depression therein, a member pressed against said cam to follow the contour .thereo ,and a plural sheet detector normally preventing the'cam engaging'member from passing into its depression but which upon the occurrance of abnormal sheet feedin conditions releases said cam engaging mem er for permittingmovement of said latch to trip the press and for permitting said clamping member to exert a clampin action.

Signed at Chicago, Illinois, this 8th day of April, 1924. is

JOSEPH R. swims; 

